Steckby-Lödderitzer Forst, Nature reserve in Saxony-Anhalt, Germany.

Steckby-Lödderitzer Forst is a nature reserve in Saxony-Anhalt that covers roughly 3,820 hectares (9,440 acres) along the Elbe River. The landscape includes forests, meadows, wetlands, and numerous ponds distributed across the stretch between Aken and Breitenhagen.

Parts of the forest were first protected in 1929, and a nature reserve was designated on 1 May 1961. On 24 November 1979 the area was recognised as the Steckby-Lödderitzer Forst Biosphere Reserve, the nucleus of today's Mittelelbe Biosphere Reserve. A new reserve ordinance of 23 December 2003 replaced the 1961 designation, and on 21 December 2018 the area was absorbed into the new Mittelelbe zwischen Mulde und Saale nature reserve.

The name links the villages of Steckby and Lödderitz on opposite banks of the Elbe. The forest became the core of the Middle Elbe Biosphere Reserve, recognised on 24 November 1979. Visitors can look for the Elbe beaver, a species resident in the old arms, and for the large oak beetle in the hardwood floodplain.

The reserve lies northwest of Aken (Elbe) within the Mittelelbe Biosphere Reserve, stretching along the Elbe floodplain to below the Saale confluence. The Lödderitzer Forst on the left bank holds hardwood floodplain forest with old arms and still waters; the dike was moved back over seven kilometres between October 2009 and 2017, reopening about 600 hectares to the river's dynamics. Parts of the area are total reserves left to natural development, so stay on paths.

The reserve includes around 710 hectares of core zones where nature evolves completely on its own without any human involvement. These undisturbed sections support over 100 breeding bird species and rare plants that thrive in their native conditions.